/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

/**
 * @author Alexander Y. Kleymenov
 */

package org.apache.harmony.security.x509;

import java.io.IOException;

import org.apache.harmony.security.asn1.ASN1Explicit;
import org.apache.harmony.security.asn1.ASN1Implicit;
import org.apache.harmony.security.asn1.ASN1Sequence;
import org.apache.harmony.security.asn1.ASN1Type;
import org.apache.harmony.security.asn1.BerInputStream;
import org.apache.harmony.security.internal.nls.Messages;

/**
 * The class encapsulates the ASN.1 DER encoding/decoding work with the
 * DistributionPoint structure which is the part of X.509 CRL (as specified in
 * RFC 3280 - Internet X.509 Public Key Infrastructure. Certificate and
 * Certificate Revocation List (CRL) Profile.
 * http://www.ietf.org/rfc/rfc3280.txt):
 * 
 * <pre>
 *  CRLDistributionPoints ::= SEQUENCE SIZE (1..MAX) OF DistributionPoint
 * 
 *  DistributionPoint ::= SEQUENCE {
 *        distributionPoint       [0]     DistributionPointName OPTIONAL,
 *        reasons                 [1]     ReasonFlags OPTIONAL,
 *        cRLIssuer               [2]     GeneralNames OPTIONAL 
 *  }
 * 
 *  DistributionPointName ::= CHOICE {
 *        fullName                [0]     GeneralNames,
 *        nameRelativeToCRLIssuer [1]     RelativeDistinguishedName 
 *  }
 * 
 *  ReasonFlags ::= BIT STRING {
 *        unused                  (0),
 *        keyCompromise           (1),
 *        cACompromise            (2),
 *        affiliationChanged      (3),
 *        superseded              (4),
 *        cessationOfOperation    (5),
 *        certificateHold         (6),
 *        privilegeWithdrawn      (7),
 *        aACompromise            (8) 
 *  }
 * </pre>
 */
public class DistributionPoint {

	private final DistributionPointName distributionPoint;
	private final ReasonFlags reasons;
	private final GeneralNames cRLIssuer;

	/**
	 * Custom X.509 decoder.
	 */
	public static final ASN1Sequence ASN1 = new ASN1Sequence(new ASN1Type[] {
			new ASN1Explicit(0, DistributionPointName.ASN1),
			new ASN1Implicit(1, ReasonFlags.ASN1),
			new ASN1Implicit(2, GeneralNames.ASN1) }) {
		{
			setOptional(0);
			setOptional(1);
			setOptional(2);
		}

		@Override
		protected Object getDecodedObject(BerInputStream in) throws IOException {
			final Object[] values = (Object[]) in.content;
			return new DistributionPoint((DistributionPointName) values[0],
					(ReasonFlags) values[1], (GeneralNames) values[2]);
		}

		@Override
		protected void getValues(Object object, Object[] values) {
			final DistributionPoint dp = (DistributionPoint) object;
			values[0] = dp.distributionPoint;
			values[1] = dp.reasons;
			values[2] = dp.cRLIssuer;
		}
	};

	public DistributionPoint() {
		distributionPoint = null;
		reasons = null;
		cRLIssuer = null;
	}

	public DistributionPoint(DistributionPointName distributionPoint,
			ReasonFlags reasons, GeneralNames cRLIssuer) {
		if ((reasons != null) && (distributionPoint == null)
				&& (cRLIssuer == null)) {
			throw new IllegalArgumentException(
					Messages.getString("security.17F")); //$NON-NLS-1$
		}
		this.distributionPoint = distributionPoint;
		this.reasons = reasons;
		this.cRLIssuer = cRLIssuer;
	}

	/**
	 * Places the string representation of extension value into the StringBuffer
	 * object.
	 */
	public void dumpValue(StringBuffer buffer, String prefix) {
		buffer.append(prefix);
		buffer.append("Distribution Point: [\n"); //$NON-NLS-1$
		if (distributionPoint != null) {
			distributionPoint.dumpValue(buffer, prefix + "  "); //$NON-NLS-1$
		}
		if (reasons != null) {
			reasons.dumpValue(buffer, prefix + "  "); //$NON-NLS-1$
		}
		if (cRLIssuer != null) {
			buffer.append(prefix);
			buffer.append("  CRL Issuer: [\n"); //$NON-NLS-1$
			cRLIssuer.dumpValue(buffer, prefix + "    "); //$NON-NLS-1$
			buffer.append(prefix);
			buffer.append("  ]\n"); //$NON-NLS-1$
		}
		buffer.append(prefix);
		buffer.append("]\n"); //$NON-NLS-1$
	}
}
